Mobile communication system, radio base station, and mobile station

a mobile communication system and radio base station technology, applied in the field of mobile communication system, radio base station, mobile station, can solve the problems of large deterioration in the quality of uplink signals, increase in load on the radio link in the opposite direction, and load of one-bit transmission acknowledgement signals indicating ack or nack is not an allowable condition, etc., to achieve the effect of improving a radio capacity

Inactive Publication Date: 2011-11-15
NTT DOCOMO INC
View PDF32 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to improve the radio capacity when retransmission control on a transmission data block is performed. The technical effects of the invention include reducing the number of retransmissions of a transmission data block and improving the efficiency of data transmission. This is achieved by a mobile communication system, a radio base station, and a mobile station that can manage the maximum number of retransmissions and transmit the transmission acknowledgement signal only when a predetermined condition is satisfied. This helps to improve the overall efficiency of data transmission and reduce delays in communication.

Problems solved by technology

In a conventional mobile communication system, there is a problem of an increase of reception errors that results from large deterioration in the quality of uplink signals received by a radio base station and the quality of downlink signals received by a mobile station, because a received signal level in a data receiving-side apparatus instantaneously varies due to multi-path fading and the like.
However, it has a disadvantage that a transmission acknowledgement signal (Ack or Nack) is transmitted over a radio link in the opposite direction (a downlink is used when transmitting the transmission data block over an uplink, and the uplink is used when transmitting the transmission data block over the downlink), which results in an increase in load on the radio link in the opposite direction.
In other words, when a transmission data block size is large, the load of a one-bit transmission acknowledgement signal indicating Ack or Nack is appropriate for its purpose, but when a transmission data block size is small, the load of the one-bit transmission acknowledgement signal indicating Ack or Nack is not an allowable condition.
This causes a problem that the radio load on the radio link in the opposite direction is increased.
However, when the congestion degree of the radio link in the opposite direction is large, there is a problem that the influence on the mobile communication system caused by the load on the radio link in the opposite direction becomes large.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mobile communication system, radio base station, and mobile station
  • Mobile communication system, radio base station, and mobile station
  • Mobile communication system, radio base station, and mobile station

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(Configuration of Mobile Communication System of the Present Invention)

Descriptions will be given of the configuration of a mobile communication system according to an embodiment of the present invention, with reference to FIGS. 2 to 11. As illustrated in FIG. 2, the mobile communication system according to the first embodiment of the present invention includes a plurality of mobile stations UE #1 to #8, a plurality of radio base stations Node B #1 to #5, and a radio network controller RNC.

In the mobile communication system according to this embodiment, a data transmitting-side apparatus (a mobile station UE or radio base station Node B) is configured to retransmit a transmission data block according to a transmission acknowledgement signal (Ack or Nack) transmitted from a data receiving-side apparatus (a radio base station Node B or a mobile station UE).

The present invention can be applied to each of the mobile communication in an uplink (the mobile communication where the data tr...

embodiment 1

Alternative Embodiment 1

In alternative embodiment 1 of the present invention, the HARQ processor unit 12l2 is configured to transmit the transmission acknowledgement signal, when a predetermined condition is satisfied even if the number of retransmissions of the transmission data block reaches the maximum number of retransmissions.

In other words, it is necessary for the HARQ processor unit 12l2 to determine whether or not the predetermined condition is satisfied, when the number of retransmissions of the transmission data block reaches the maximum number of retransmissions.

FIG. 14 shows the operations of the data receiving-side apparatus (radio base station Node B) according to the alternative embodiment 1. The present operations are the same as those of the data receiving-side apparatus (radio base station Node B) in the first embodiment shown in FIG. 13, except for the addition of step 208.

The following will explain an example of determining whether or not the predetermined condit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a mobile communication system according to the present invention, a data transmitting-side apparatus is configured to retransmit a transmission data block according to a transmission acknowledgement signal transmitted from a data receiving-side apparatus. The data receiving-side apparatus includes: a maximum number-of-retransmissions manager unit configured to manage the maximum number of retransmissions of the transmission data block; and a transmission acknowledgement signal transmitter unit configured not to transmit the transmission acknowledgement signal, when the number of retransmissions of the transmission data block reaches the maximum number of retransmissions.

Description

TECHNICAL FIELDThe present invention relates to a mobile communication system in which a data transmitting-side apparatus is configured to retransmit a transmission data block according to a transmission acknowledgement signal transmitted from a data receiving-side apparatus, and a radio base station and mobile station that are used in such mobile communication system.BACKGROUND ARTIn a conventional mobile communication system, there is a problem of an increase of reception errors that results from large deterioration in the quality of uplink signals received by a radio base station and the quality of downlink signals received by a mobile station, because a received signal level in a data receiving-side apparatus instantaneously varies due to multi-path fading and the like.As a technique for overcoming the aforementioned problem, there is known hybrid ARQ (Auto Repeat reQuest and hereinafter referred to as HARQ).As illustrated in FIG. 1, in the HARQ, a data receiving-side apparatus ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04B1/00H04W28/00H04W28/04
CPCH04L1/0007H04L1/1838H04L1/1854H04L1/1607H04L1/1812H04L5/0055
InventorUSUDA, MASAFUMIUMESH, ANILNAKAMURA, TAKEHIRO
OwnerNTT DOCOMO INC